Abstract
The inhibitive action of some phenylthiazole derivatives namely: 2-acetylamino-5-p-bromophenylazo-4-phenylthiazole (BPT), 2-acetylamino-5-p-methylphenylazo-4-phenylthiazole (MPT), 2-acetylamino-5-p-methoxyphenylazo-4-phenylthiazole (XPT) and 2-acetylamino-5-p-nitrophenylazo-4-phenylthiazole (NPT), on zinc corrosion in 0.2 M HCl has been studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS)and electrochemical frequency modulation (EFM) measurements. The results showed that the dissolution rate of zinc decreases with increasing the phenylthiazole derivatives concentration and decreases with raising temperature. Polarization curves indicated that the studied inhibitors act as mixed-type inhibitors. The adsorption of the investigated compounds follows Langmuir adsorption isotherm model. The thermodynamic parameters of adsorption and corrosion processes were determined and discussed.
Highlights
Zinc is one of the most widely used metal and is often attacked by aggressive media such as acids, bases and salt solutions [1,2].Acids are widely used in industries such as picking, cleaning, descaling [3,4,5]
We investigated the effect of some phenylthiazole derivatives on the electrochemical behavior of zinc in acidic medium using chemical and electrochemical measurements (potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM)) techniques
Weight loss of zinc was determined at various time intervals in the absence and presence of different concentrations of four phenylthiazole derivatives
Summary
Zinc is one of the most widely used metal and is often attacked by aggressive media such as acids, bases and salt solutions [1,2].Acids are widely used in industries such as picking, cleaning, descaling [3,4,5]. Organic compounds containing N, P, S, and O in their molecular structures have been confirmed to be effective inhibitors because of their ability to be adsorbed on the metal surface. Adsorption of these compounds on the metal surface leading to the formation of a protective film [7,8,9,10], due to the interaction of the lone pair electron and/or π-orbitals of the inhibitor with the d-orbitals of the metal surface atoms, and is highly dependent on the nature and surface charge of the metal, the type of aggressive electrolyte, and the chemical structure of the inhibitor [11]. We investigated the effect of some phenylthiazole derivatives on the electrochemical behavior of zinc in acidic medium using chemical (weight loss) and electrochemical measurements (potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM)) techniques
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